code: def getMetaApprovedBy(self, label: str):
      return self.getMeta(key=self.APPROVED_BY, label=label)
  
file_path: MONAILabel/plugins/slicer/MONAILabelReviewer/MONAILabelReviewerLib/DataStoreKeys.py
imports: from typing import List
label_desc: Use image node_id 5 for calling the DataStoreKeys obj's underlying member method code with example usage: obj.getMetaApprovedBy(label) and returns: self